From 0af60b1fafc933ed20bc7dd0a46f26bd752353cd Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Mon, 9 Oct 2023 14:04:08 +1030 Subject: [PATCH] btrfs-progs: mkfs: add the missing xattr for the rootdir inode [BUG] When using "mkfs.btrfs" with "--rootdir" option, the top level inode (rootdir) will not get the same xattr from the source dir: mkdir -p source_dir/ touch source_dir/file setfattr -n user.rootdir_xattr source_dir/ setfattr -n user.regular_xattr source_dir/file mkfs.btrfs -f --rootdir source_dir $dev mount $dev $mnt getfattr $mnt # Nothing <<< getfattr $mnt/file # file: $mnt/file user.regular_xattr <<< [CAUSE] In function traverse_directory(), we only call add_xattr_item() for all the child inodes, not really for the rootdir inode itself, leading to the missing xattr items. Not only xattr, in fact we also miss the uid/gid/timestamps/mode for the rootdir inode. [FIX] Extract a dedicated function, copy_rootdir_inode(), to handle every needed attributes for the rootdir inode, including: - xattr - uid - gid - mode - timestamps Issue: #688 Signed-off-by: Qu Wenruo Signed-off-by: David Sterba --- mkfs/rootdir.c | 87 ++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 66 insertions(+), 21 deletions(-) diff --git a/mkfs/rootdir.c b/mkfs/rootdir.c index a413a31e..4ae9f435 100644 --- a/mkfs/rootdir.c +++ b/mkfs/rootdir.c @@ -429,6 +429,68 @@ end: return ret; } +static int copy_rootdir_inode(struct btrfs_trans_handle *trans, + struct btrfs_root *root, const char *dir_name) +{ + u64 root_dir_inode_size; + struct btrfs_inode_item *inode_item; + struct btrfs_path path = { 0 }; + struct btrfs_key key; + struct extent_buffer *leaf; + struct stat st; + int ret; + + ret = stat(dir_name, &st); + if (ret < 0) { + ret = -errno; + error("stat failed for direcotry %s: %m", dir_name); + return ret; + } + + ret = add_xattr_item(trans, root, btrfs_root_dirid(&root->root_item), dir_name); + if (ret < 0) { + errno = -ret; + error("failed to add xattr item for the top level inode: %m"); + return ret; + } + + key.objectid = btrfs_root_dirid(&root->root_item); + key.offset = 0; + key.type = BTRFS_INODE_ITEM_KEY; + ret = btrfs_lookup_inode(trans, root, &path, &key, 1); + if (ret > 0) + ret = -ENOENT; + if (ret) { + error("failed to lookup root dir: %d", ret); + goto error; + } + + leaf = path.nodes[0]; + inode_item = btrfs_item_ptr(leaf, path.slots[0], struct btrfs_inode_item); + + root_dir_inode_size = calculate_dir_inode_size(dir_name); + btrfs_set_inode_size(leaf, inode_item, root_dir_inode_size); + + /* Unlike fill_inode_item, we only need to copy part of the attributes. */ + btrfs_set_inode_uid(leaf, inode_item, st.st_uid); + btrfs_set_inode_gid(leaf, inode_item, st.st_gid); + btrfs_set_inode_mode(leaf, inode_item, st.st_mode); + btrfs_set_timespec_sec(leaf, &inode_item->atime, st.st_atime); + btrfs_set_timespec_nsec(leaf, &inode_item->atime, 0); + btrfs_set_timespec_sec(leaf, &inode_item->ctime, st.st_ctime); + btrfs_set_timespec_nsec(leaf, &inode_item->ctime, 0); + btrfs_set_timespec_sec(leaf, &inode_item->mtime, st.st_mtime); + btrfs_set_timespec_nsec(leaf, &inode_item->mtime, 0); + /* FIXME */ + btrfs_set_timespec_sec(leaf, &inode_item->otime, 0); + btrfs_set_timespec_nsec(leaf, &inode_item->otime, 0); + btrfs_mark_buffer_dirty(leaf); + +error: + btrfs_release_path(&path); + return ret; +} + static int traverse_directory(struct btrfs_trans_handle *trans, struct btrfs_root *root, const char *dir_name, struct directory_name_entry *dir_head) @@ -436,7 +498,6 @@ static int traverse_directory(struct btrfs_trans_handle *trans, int ret = 0; struct btrfs_inode_item cur_inode; - struct btrfs_inode_item *inode_item; int count, i, dir_index_cnt; struct dirent **files; struct stat st; @@ -445,10 +506,6 @@ static int traverse_directory(struct btrfs_trans_handle *trans, ino_t parent_inum, cur_inum; ino_t highest_inum = 0; const char *parent_dir_name; - struct btrfs_path path = { 0 }; - struct extent_buffer *leaf; - struct btrfs_key root_dir_key; - u64 root_dir_inode_size = 0; /* Add list for source directory */ dir_entry = malloc(sizeof(struct directory_name_entry)); @@ -466,25 +523,13 @@ static int traverse_directory(struct btrfs_trans_handle *trans, dir_entry->inum = parent_inum; list_add_tail(&dir_entry->list, &dir_head->list); - root_dir_key.objectid = btrfs_root_dirid(&root->root_item); - root_dir_key.offset = 0; - root_dir_key.type = BTRFS_INODE_ITEM_KEY; - ret = btrfs_lookup_inode(trans, root, &path, &root_dir_key, 1); - if (ret) { - error("failed to lookup root dir: %d", ret); + ret = copy_rootdir_inode(trans, root, dir_name); + if (ret < 0) { + errno = -ret; + error("failed to copy rootdir inode: %m"); goto fail_no_dir; } - leaf = path.nodes[0]; - inode_item = btrfs_item_ptr(leaf, path.slots[0], - struct btrfs_inode_item); - - root_dir_inode_size = calculate_dir_inode_size(dir_name); - btrfs_set_inode_size(leaf, inode_item, root_dir_inode_size); - btrfs_mark_buffer_dirty(leaf); - - btrfs_release_path(&path); - do { parent_dir_entry = list_entry(dir_head->list.next, struct directory_name_entry,